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Just for clarification here- this kit is based off the kit available from ECS, however it is rebuilt with StopTech aluminum pistons, high heat dust boots and seals. These parts are $400, plus the titanium het shields are $135... This kit is overkill and incomplete for a street use car- but if you track your car, this setup is much more usable than that kit since the performance rotors, and ceramic tipped pistons are prone to failure under high performance driving use.

It will fit with the unmodified bracket on a non-m, just the brake pad will be a few mm off (I have ran it this way without a problem lol) If you want it to fit perfect, you have to do what ECS did to align the caliper exactly how it should be. And they just use the M rotors because it is the right size. These are basically 6-piston brembo's branded for BMW, not a bad deal for anyone looking to upgrade. I can stop on a dime AND that is with the crappy stock pads!

It will fit with the unmodified bracket on a non-m, just the brake pad will be a few mm off (I have ran it this way without a problem lol) If you want it to fit perfect, you have to do what ECS did to align the caliper exactly how it should be. And they just use the M rotors because it is the right size. These are basically 6-piston brembo's branded for BMW, not a bad deal for anyone looking to upgrade. I can stop on a dime AND that is with the crappy stock pads!

Glad you're happy with the setup, the alignment isn't off by much- in fact the bracket only needs to be shaved by 6.5mm in one dimension to be perfect. I spent a bit of time measuring and planning this out.
Also, the ECS kit doesn't use m3 rotors, rather they use the performance rotors for the 330 that maintains all the dimensions of a stock rotor, the m3 rotors are also the same dimensions with the exception that the rotor thickness is slightly greater at 28mm vs 25mm.

ill be making the brackets, and have decided to keep them for as long as it takes for me to make, fit, test the brackets... then, who knows... i will see at that time if I can live without them, or not... I don't believe I will be tracking my car for a couple years due to financial constraints, so I may still sell when done.

Not currently- I've decided to make a bit more of a project out of them yet... I am selling the pistons/seals/boots to a friend, and will be making my own pistons, as well as stripping and powdercoating them as they show a little abuse... Currently planning to use a high heat powdercoating so they will withstand track abuse...
I may try to start finding/rebuilding and reselling these soon, so keep in touch if you're Interested.

Maybe.... Lol. I have a set that will be track tested soon, and a second set ill be rebuilding my calipers with... If I have interest, ill have a batch made. I have a 5 set minimum order to fulfill in order to have them run at the machine shop.